I've had this on my home defense gun, maybe shot 10-15 rds with it on my Sig 226. Laser lines up well, holds zero for that one time I tested it but over all it's a heck of a deal for a extremely bright laser/light combo. Only reason I am getting rid of it is my friend got a spare Streamlight version which is supposed to be just a little bit better at a price I can't refuse. This piece comes with a tiny allen wrench which attaches to the light which is the one complaint I have since I have no idea where the heck it went. However it was sighted in on my 226 before and i'm sure you can find a small allen wrench to zero it. The light by the way is awesome and you can program the buttons to do different things like light on/combo etc. Just to clarify it DOES have a windage adjustment and side to side it just uses a tiny allen wrench. I have the box & all paperwork.